How to fix a very distorted mesh after having imported a BVH file with the Manuel Bastioni Lab
Other than proportional edit, the following techniques might be handy.


Move vertecies along normal :Alt+S
Smooth Mesh : Tool shelf > Mesh Tools > Deform: Smooth Vertex
To Sphere : Alt+Shift+S
Shrink Wrap Modifier (use vertex group to specify vertecies)


Hope they help.